+ /*
+ * Timing Config 0.
+ * Avoid writing for DDR I. The new PQ38 DDR controller
+ * dreams up non-zero default values to be backwards compatible.
+ */
+ if (spd.mem_type == SPD_MEMTYPE_DDR2) {
+ unsigned char taxpd_clk = 8; /* By the book. */
+ unsigned char tmrd_clk = 2; /* By the book. */
+ unsigned char act_pd_exit = 2; /* Empirical? */
+ unsigned char pre_pd_exit = 6; /* Empirical? */
+
+ ddr->timing_cfg_0 = (0
+ | ((act_pd_exit & 0x7) << 20) /* ACT_PD_EXIT */
+ | ((pre_pd_exit & 0x7) << 16) /* PRE_PD_EXIT */
+ | ((taxpd_clk & 0xf) << 8) /* ODT_PD_EXIT */
+ | ((tmrd_clk & 0xf) << 0) /* MRS_CYC */
+ );
+#if 0
+ ddr->timing_cfg_0 |= 0xaa000000; /* extra cycles */
+#endif
+ debug("DDR: timing_cfg_0 = 0x%08x\n", ddr->timing_cfg_0);
+
+ } else {
+#if 0
+ /*
+ * Force extra cycles with 0xaa bits.
+ * Incidentally supply the dreamt-up backwards compat value!
+ */
+ ddr->timing_cfg_0 = 0x00110105; /* backwards compat value */
+ ddr->timing_cfg_0 |= 0xaa000000; /* extra cycles */
+ debug("DDR: HACK timing_cfg_0 = 0x%08x\n", ddr->timing_cfg_0);
+#endif
+ }
+
+
+ /*
+ * Some Timing Config 1 values now.
+ * Sneak Extended Refresh Recovery in here too.
+ */
+
+ /*
+ * For DDR I, WRREC(Twr) and WRTORD(Twtr) are not in SPD,
+ * use conservative value.
+ * For DDR II, they are bytes 36 and 37, in quarter nanos.
+ */
+
+ if (spd.mem_type == SPD_MEMTYPE_DDR) {
+ twr_clk = 3; /* Clocks */
+ twtr_clk = 1; /* Clocks */
+ } else {
+ twr_clk = picos_to_clk(spd.twr * 250);
+ twtr_clk = picos_to_clk(spd.twtr * 250);
+ }
+
+ /*
+ * Calculate Trfc, in picos.
+ * DDR I: Byte 42 straight up in ns.
+ * DDR II: Byte 40 and 42 swizzled some, in ns.
+ */
+ if (spd.mem_type == SPD_MEMTYPE_DDR) {
+ trfc = spd.trfc * 1000; /* up to ps */
+ } else {
+ unsigned int byte40_table_ps[8] = {
+ 0,
+ 250,
+ 330,
+ 500,
+ 660,
+ 750,
+ 0,
+ 0
+ };
+
+ trfc = (((spd.trctrfc_ext & 0x1) * 256) + spd.trfc) * 1000
+ + byte40_table_ps[(spd.trctrfc_ext >> 1) & 0x7];
+ }
+ trfc_clk = picos_to_clk(trfc);
+
+ /*
+ * Trcd, Byte 29, from quarter nanos to ps and clocks.
+ */
+ trcd_clk = picos_to_clk(spd.trcd * 250) & 0x7;
+
+ /*
+ * Convert trfc_clk to DDR controller fields. DDR I should
+ * fit in the REFREC field (16-19) of TIMING_CFG_1, but the
+ * 8548 controller has an extended REFREC field of three bits.
+ * The controller automatically adds 8 clocks to this value,
+ * so preadjust it down 8 first before splitting it up.
+ */
+ trfc_low = (trfc_clk - 8) & 0xf;
+ trfc_high = ((trfc_clk - 8) >> 4) & 0x3;
+
+ /*
+ * Sneak in some Extended Refresh Recovery.
+ */
+ ddr->ext_refrec = (trfc_high << 16);
+ debug("DDR: ext_refrec = 0x%08x\n", ddr->ext_refrec);
+
+ ddr->timing_cfg_1 =
+ (0
+ | ((picos_to_clk(spd.trp * 250) & 0x07) << 28) /* PRETOACT */
+ | ((picos_to_clk(spd.tras * 1000) & 0x0f ) << 24) /* ACTTOPRE */
+ | (trcd_clk << 20) /* ACTTORW */
+ | (caslat_ctrl << 16) /* CASLAT */
+ | (trfc_low << 12) /* REFEC */
+ | ((twr_clk & 0x07) << 8) /* WRRREC */
+ | ((picos_to_clk(spd.trrd * 250) & 0x07) << 4) /* ACTTOACT */
+ | ((twtr_clk & 0x07) << 0) /* WRTORD */
+ );
+
+ debug("DDR: timing_cfg_1 = 0x%08x\n", ddr->timing_cfg_1);
+
+
+ /*
+ * Timing_Config_2
+ * Was: 0x00000800;
+ */
+
+ /*
+ * Additive Latency
+ * For DDR I, 0.
+ * For DDR II, with ODT enabled, use "a value" less than ACTTORW,
+ * which comes from Trcd, and also note that:
+ * add_lat + caslat must be >= 4
+ */
+ add_lat = 0;
+ if (spd.mem_type == SPD_MEMTYPE_DDR2
+ && (odt_wr_cfg || odt_rd_cfg)
+ && (caslat < 4)) {
+ add_lat = 4 - caslat;
+ if (add_lat > trcd_clk) {
+ add_lat = trcd_clk - 1;
+ }
+ }
+
+ /*
+ * Write Data Delay
+ * Historically 0x2 == 4/8 clock delay.
+ * Empirically, 0x3 == 6/8 clock delay is suggested for DDR I 266.
+ */
+ wr_data_delay = 3;
+
+ /*
+ * Write Latency
+ * Read to Precharge
+ * Minimum CKE Pulse Width.
+ * Four Activate Window
+ */
+ if (spd.mem_type == SPD_MEMTYPE_DDR) {
+ /*
+ * This is a lie. It should really be 1, but if it is
+ * set to 1, bits overlap into the old controller's
+ * otherwise unused ACSM field. If we leave it 0, then
+ * the HW will magically treat it as 1 for DDR 1. Oh Yea.
+ */
+ wr_lat = 0;
+
+ trtp_clk = 2; /* By the book. */
+ cke_min_clk = 1; /* By the book. */
+ four_act = 1; /* By the book. */
+
+ } else {
+ wr_lat = caslat - 1;
+
+ /* Convert SPD value from quarter nanos to picos. */
+ trtp_clk = picos_to_clk(spd.trtp * 250);
+
+ cke_min_clk = 3; /* By the book. */
+ four_act = picos_to_clk(37500); /* By the book. 1k pages? */
+ }
+
+ /*
+ * Empirically set ~MCAS-to-preamble override for DDR 2.
+ * Your milage will vary.
+ */
+ cpo = 0;
+ if (spd.mem_type == SPD_MEMTYPE_DDR2) {
+ if (effective_data_rate == 266 || effective_data_rate == 333) {
+ cpo = 0x7; /* READ_LAT + 5/4 */
+ } else if (effective_data_rate == 400) {
+ cpo = 0x9; /* READ_LAT + 7/4 */
+ } else {
+ /* Pure speculation */
+ cpo = 0xb;
+ }
+ }
+
+ ddr->timing_cfg_2 = (0
+ | ((add_lat & 0x7) << 28) /* ADD_LAT */
+ | ((cpo & 0x1f) << 23) /* CPO */
+ | ((wr_lat & 0x7) << 19) /* WR_LAT */
+ | ((trtp_clk & 0x7) << 13) /* RD_TO_PRE */
+ | ((wr_data_delay & 0x7) << 10) /* WR_DATA_DELAY */
+ | ((cke_min_clk & 0x7) << 6) /* CKE_PLS */
+ | ((four_act & 0x1f) << 0) /* FOUR_ACT */
+ );
+
+ debug("DDR: timing_cfg_2 = 0x%08x\n", ddr->timing_cfg_2);
+
+
+ /*
+ * Determine the Mode Register Set.
+ *
+ * This is nominally part specific, but it appears to be
+ * consistent for all DDR I devices, and for all DDR II devices.
+ *
+ * caslat must be programmed
+ * burst length is always 4
+ * burst type is sequential
+ *
+ * For DDR I:
+ * operating mode is "normal"
+ *
+ * For DDR II:
+ * other stuff
+ */
+
+ mode_caslat = 0;
+
+ /*
+ * Table lookup from DDR I or II Device Operation Specs.
+ */
+ if (spd.mem_type == SPD_MEMTYPE_DDR) {
+ if (1 <= caslat && caslat <= 4) {
+ unsigned char mode_caslat_table[4] = {
+ 0x5, /* 1.5 clocks */
+ 0x2, /* 2.0 clocks */
+ 0x6, /* 2.5 clocks */
+ 0x3 /* 3.0 clocks */
+ };
+ mode_caslat = mode_caslat_table[caslat - 1];
+ } else {
+ puts("DDR I: Only CAS Latencies of 1.5, 2.0, "
+ "2.5 and 3.0 clocks are supported.\n");
+ return 0;
+ }
+
+ } else {
+ if (2 <= caslat && caslat <= 5) {
+ mode_caslat = caslat;
+ } else {
+ puts("DDR II: Only CAS Latencies of 2.0, 3.0, "
+ "4.0 and 5.0 clocks are supported.\n");
+ return 0;
+ }
+ }
+
+ /*
+ * Encoded Burst Lenght of 4.
+ */
+ burst_len = 2; /* Fiat. */
+
+ if (spd.mem_type == SPD_MEMTYPE_DDR) {
+ twr_auto_clk = 0; /* Historical */
+ } else {
+ /*
+ * Determine tCK max in picos. Grab tWR and convert to picos.
+ * Auto-precharge write recovery is:
+ * WR = roundup(tWR_ns/tCKmax_ns).
+ *
+ * Ponder: Is twr_auto_clk different than twr_clk?
+ */
+ tCKmax_ps = convert_bcd_tenths_to_cycle_time_ps(spd.tckmax);
+ twr_auto_clk = (spd.twr * 250 + tCKmax_ps - 1) / tCKmax_ps;
+ }
+
+
+ /*
+ * Mode Reg in bits 16 ~ 31,
+ * Extended Mode Reg 1 in bits 0 ~ 15.
+ */
+ mode_odt_enable = 0x0; /* Default disabled */
+ if (odt_wr_cfg || odt_rd_cfg) {
+ /*
+ * Bits 6 and 2 in Extended MRS(1)
+ * Bit 2 == 0x04 == 75 Ohm, with 2 DIMM modules.
+ * Bit 6 == 0x40 == 150 Ohm, with 1 DIMM module.
+ */
+ mode_odt_enable = 0x40; /* 150 Ohm */
+ }
+
+ ddr->sdram_mode =
+ (0
+ | (add_lat << (16 + 3)) /* Additive Latency in EMRS1 */
+ | (mode_odt_enable << 16) /* ODT Enable in EMRS1 */
+ | (twr_auto_clk << 9) /* Write Recovery Autopre */
+ | (mode_caslat << 4) /* caslat */
+ | (burst_len << 0) /* Burst length */
+ );
+
+ debug("DDR: sdram_mode = 0x%08x\n", ddr->sdram_mode);
+
+
+ /*
+ * Clear EMRS2 and EMRS3.
+ */
+ ddr->sdram_mode_2 = 0;
+ debug("DDR: sdram_mode_2 = 0x%08x\n", ddr->sdram_mode_2);
+
+
+ /*
+ * Determine Refresh Rate. Ignore self refresh bit on DDR I.
+ * Table from SPD Spec, Byte 12, converted to picoseconds and
+ * filled in with "default" normal values.
+ */
+ {
+ unsigned int refresh_clk;
+ unsigned int refresh_time_ns[8] = {
+ 15625000, /* 0 Normal 1.00x */
+ 3900000, /* 1 Reduced .25x */
+ 7800000, /* 2 Extended .50x */
+ 31300000, /* 3 Extended 2.00x */
+ 62500000, /* 4 Extended 4.00x */
+ 125000000, /* 5 Extended 8.00x */
+ 15625000, /* 6 Normal 1.00x filler */
+ 15625000, /* 7 Normal 1.00x filler */
+ };
+
+ refresh_clk = picos_to_clk(refresh_time_ns[spd.refresh & 0x7]);
+
+ /*
+ * Set BSTOPRE to 0x100 for page mode
+ * If auto-charge is used, set BSTOPRE = 0
+ */
+ ddr->sdram_interval =
+ (0
+ | (refresh_clk & 0x3fff) << 16
+ | 0x100
+ );
+ debug("DDR: sdram_interval = 0x%08x\n", ddr->sdram_interval);
+ }
+
+ /*
+ * Is this an ECC DDR chip?
+ * But don't mess with it if the DDR controller will init mem.
+ */
+#if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
+ if (spd.config == 0x02) {